Water-heating attachment for furnaces.



H. LAWRIE. WATER HEATING ATTACHMENT FOR FURNACES. APPLICATION FILED DEC. 12, 1911.

1,026,753. Patented May 21,1912.

Harry Law/fa, anvmtoz,

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HARRY LAWRIE, OF OMAHA, NEBRASKA.

WATER-HEATING- .ATTACHMENT FOR FURNACES.

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Specification of Letters Patent.

Application filed December 12, 1911. Serial No. 665,384.

To all whom it may concern:

Be it known that I, HARRY LAWRIE, a citizen of the United States, and a resident of Omaha, in the county of Douglas and State of Nebraska, have invented certain new and useful Improvements in VVater- Heating Attachments for Furnaces, of which the following is a specification.

My invention relates to furnaces of the kinds used in heating dwellings, and especially to water-heating appliances used in? connection with such furnaces.

It is the object of my invention to provide in connection with furnaces of this type an auxiliary water-heating means arranged so that it will not. interfere with the firing,

cleaning or drafts of the furnace, and of which the interior of the heating device is readily accessible so that accumulations of sediment or scale may be removed'therefrom. i

A further objectof my invention is to enable the cleaning out of the auxiliary waterheater without disturbing or disconnecting the piping leading thereto.

In the accompanying drawings, Figure 1 sure steam furnaces as ordinarily used in dwellings, when it is desired to.also heat water for bathing, kitchen, laundry or simi-.

lar purposes. it is customary to extend a coil or loop of pipe into the combustion chamber of the furnace, connecting said coil with a storage tank so that a circulation of water may occur between the tank and heatingcoil, the tank also being connected with the cold-water supply of the house and with the taps from which the hot water is to be drawn. When such'a coil or loop of pipe is placed in the combustion chamber of the furnace it usuallyinterferes wlth the firing and cleaning of the furnace and frequently is necessarily so placed that it interferes with the drafts. In localities where Y the water supply contains any appreclableiquantity of mineral matter held in solutlon, such mineral matter is deposited as a hardscale on the inside of the heating coil. This scale, being a poor conductor of heat. interferes with the absorption of heat by the water in the coil and. by continued accumulation, may even entirely close the opening through the coil so that it will be burned out, or, if water Patented May 21, 1912.

is confined therein, cause an explosion. It

is usually impracticable, if not impossible, to clean the scale out of heating coils of this kind, and the remedy ordinarily employed is to remove the coil and replace it with a new one: My invention obviates all of the above diflicult-ies.

In the accompanying drawings my invention is shown as applied to a sectional castmetal water-heatingfurnace of an ordinary type in which the lower or base section 1 forms the ash-pit and is provided with the usual ash-pit door 2'and draft-door 3. The

section 4 which is disposed above the section 1, has at the bottom the grate 5 and at one side thereof the fuel door 6. Thesection 4 and the succeeding superposed sections 7 are formed witlrcommunicating water-spaces 8 therein, through which is circulated the water used in the radiators with which the'furnace is connected, and the sections 7 are also formed with suitable passages 9 through them for the circulation of the combustion products passing from the fuel and combustion chamber 10 of which the section 4 forms the inclosing casing.

In the sideof the section 4 opposite the fuel door 6 is formed the auxiliary waterheating chamber 11 of which the outer side is closed by a cover-plate 12 removably secured thereon by screws13. With the exception of the cover-plate 12 the walls of the chamber 11 are formed integrally with the walls of the fuel and combustion chamber 10, and, preferably,'there are several integral flanges 14 extended from the inner wall of the chamber out to the cover-plate. Said flanges 1a are stopped off to form vertical openings past them at alternate ends there of, as shown in Fig. 3. At the outer side of the chamber 11 and at one end thereof is an overhanging flange 15 into wh1cl1 are screwed the supply and outlet pipes 16 and .17 which extend to the usual hot-water tank or reservoir. The flanges 14 serve as baflieplatesto direct the circulation of water through the heating chamber. and also, being integral with the wallof the chamber which adjoins the fuel and combustion tall chamber of the furnace, serve to materially increase the radiating surface available for heating the water which is circulated through the chamber.

It will be obvious. that, by the construction shown, a supply of water for washing and similar purposes may be efiectively heated without interferin with the firing, cleaning or the drafts 0 the furnace. It will also be apparent that any sediment or scale which may accumulate in the chamber 11 may be readily removed after taking off the cover-plate 12, as shown in Fig. 3, and that the removal of the cover-plate does not necessitate the disconnecting of the pipes 16 and 17. I

Now, having described my invention, what I claim and desire to secure by Letters Patent, is: r

lpThe combination with a cast-metal heating furnace, of an auxiliary waterheater comprising means integral with the walls of the fueland combustion chamber and forming a heating chamber adjoining the same, Water pipes connecting with said auxiliary h'eater chamber, and an external removable cover-plate for said heater chamber.

2. The combination with a heating furnace having a cast-metal casing inclosing a combustion chamber and a main water-heating chamber, of a casing integral with the first and inclosing an auxiliary water-heating chamber separate from the main waterheating chamber, and water supply and outlet pipes connected with said auxiliary water-heating chamber.

3. In a furnace, the combination with a metal casing inclosing a combustion chamher and a main heating chamber, of a casing formed integrally therewith and inclosing an auxiliary water-heating chamber adjoining the combustion chamber, supply and outlet-pipes connected with the latter casing,

weaves and flanges extending into the latter chamber from the wall thereof adjoining the combustion chamber.

4. The combination with a cast-metal heating furnace, of a metal casing having one side thereof adjoining the combustion chamber of the furnace, a removable cover-plate at combustion chamber by a single wall, a re movable c0ver-plate forming the outer wall of the water-chamber, and flanges extending from the wall of the combustion chamber into the water chamber.

6. In a furnace, an integral metal casing inclosing a combustion chamber,a main heating chamber and an auxiliary water-chamber of which the inner wall is coincident with the wall of the combustion chamber, a

removable cover-plate forming the outer wall of the Water-chamber, water supply and outlet pipes connected with the water-chamber casing, and flanges integral with and extending from the inner wall of the waterchamber to the cover-plate, said flanges being to all parts ofthe chamber to the outlet pipe. In testimony whereof I have hereunto subscribed my name in the presence of two witnesses.

HARRY LAWRIE.

' Witnesses:

.-PEA1RL KELLEY,

D. O. BARNETT.

"adapted to direct water from the supply pipe 

